A team of French researchers at Institut Polytechnique de Grenoble was able to develop a wallpaper that can allegedly block Wi-Fi signals.

The French researchers said that the wallpaper is currently being licensed to a Finnish manufacturer for production, and that it’s cost will be similar to a traditional mid-range wallpaper. The team hopes to have the Wi-Fi blocking wallpaper available in the market next year.

I don't think this could kill wardriving, but who knows, maybe in a few years it will be standard in new homes?

I would not recommend possessing or using a jammer of any kind. The FCC is pretty good about enforcement and politely hands out a paper that reads, "Notice of Apparent Liability for Forfeiture." And they ask for several thousand dollars and up, using federal courts to speed cooperation. If you want to have a bad day...

And you have the signals coming from below and upper floor. Can travel three floors easily. Plus the windows. What are they doing this for ?
Just buy a professional jammer and all is gone. Or they have electomagnetic-illness ? Do we know the real purpose of this wallpaper ?
Ciao

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